摘要
试验旨在研究早期断奶对羔羊器官发育及营养物质表观消化率的影响。选取体重(9.5±1.2) kg、日龄(25.0±1.5) d的健康杂交绵羊羔羊36只(公母各半)进行饲养试验,随机分为3组,即对照组、试验Ⅰ组、试验Ⅱ组,每组12只,分为3个重复,对照组自然哺乳,试验Ⅰ组、试验Ⅱ组分别饲喂代乳料A、B。试验组羔羊25日龄预断奶,30日龄完全断奶,饲喂代乳料。90日龄每重复选取2只体重接近本组平均体重的健康羔羊,1只进行屠宰试验,1只进行消化试验。结果表明:试验组和对照组间屠宰率差异不显著(P>0.05);瘤胃、皱胃、小肠鲜重以及肺脏、胰腺、脾脏重,试验组均高于对照组,试验Ⅰ组显著高于对照组(P<0.05)。与对照组相比,试验组干物质、有机物、粗蛋白表观消化率差异不显著(P>0.05);试验组粗脂肪表观消化率显著低于对照组(P<0.05)。说明30日龄早期断奶饲喂代乳料有助于羔羊器官发育,不会对营养物质消化率产生显著影响。试验代乳料A和B饲喂效果均良好,在蛋白原料豆粕紧缺和价高时可调整利用。
This study aims to study the effects of early weaning on the organ development and apparent digestibility of nutrients in lambs.A total of 36 crossbred healthy lambs(half male and half female)with a similar weight(9.5±1.2)kg and age(25.0±1.5)d were selected for rearing experiments,and randomly divided into 3 groups,namely control group,groupⅠ,and groupⅡ,each group of 12 sheep,divided into 3 replicates.The control group naturally lactated,groupⅠandⅡgroup were fed milk substitutes A and B respectively.The lambs in the experimental group were pre-weaned at 25 days of age and completely weaned at 30 days of age,and fed with milk substitutes.At 90 days of age,two healthy lambs with a weight close to the average weight were selected for each replicate,and one was slaughtered and one was digested.The results showed that the difference in slaughter rate between the experimental group and the control group was not significant(P>0.05).Rumen,wrinkled stomach,small intestine fresh weight,lung,pancreas,spleen weight of control group were lower than experimental group,and the differences between groupⅠand control group were significant(P<0.05).Compared with the control group,the apparent digestibility of dry matter,organic matter and crude protein of groupⅠand groupⅡwere not significantly different(P>0.05).The apparent digestibility of crude fat in the control group was significantly higher than that in the experimental group(P<0.05).It indicats that weaning feeding milk substitute at 30 days of age can help the organ development of lamb and will not have a significant effect on the digestibility of nutrients.The feeding effect of milk substitute A and B in this experiment was good,and it could be adjusted and utilized when the protein raw material soy bean meal was in short supply and high price.
作者
景爱强
王志武
JING Aiqiang;WANG Zhiwu(College of Animal Science,Shanxi Agricultural University,Shanxi Jinzhong 030800,China)
出处
《饲料工业》
北大核心
2023年第21期68-73,共6页
Feed Industry
基金
山西省重点研发项目[2022ZDYF114、201903D221004、201903D211012-02]
山西省专利专化专项项目[202301004]
山西农业大学生物育种工程项目[YZGC130]
吕梁市重点研发项目[2021NYGG-2-14]。
关键词
羔羊
早期断奶
代乳料
器官发育
营养物质表观消化率
lamb
early weaning
milk substitutes
organ development
apparent digestibility of nutrients
